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Southwest monsoon season (June to September) – 2025 rainfall forecast for different districts of Tamil Nadu is developed based on the Southern Oscillation Index and Sea Surface Temperature values of Pacific and Indian Oceans by using Australian Rainman International V.4.3. Software at Agro Climate Research Centre of Tamil Nadu Agricultural University, Coimbatore and is presented at 60% probability level. The districts of Tamil Nadu based on the predicted rainfall have been grouped hereunder.
Normal Rainfall (±10 per cent deviation from long term rainfall) is expected in most of the districts in Tamil Nadu.
Near Normal Rainfall (-10 per cent deviation from the long-term rainfall) is expected in Coimbatore, Tiruppur, Karur, Namakkal, Thenkasi, Tirunelveli, Tutucorin and Kanyakumari districts of Tamil Nadu.